package com.sky.aspect;

import com.sky.anno.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 公共字段自动填充切面类
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {
    @Before("@annotation(com.sky.anno.AutoFill)")
    public void autoFill(JoinPoint joinPoint) {  // joinPoint为连接点对象，可以获取连接点的方法名、参数等信息
        log.info("公共字段自动填充切面类");
        // 1、获取目标方法上的注解，并获取注解的属性值
        MethodSignature methodSignature = (MethodSignature) joinPoint.getSignature(); // 方法签名
        Method method = methodSignature.getMethod(); // 方法对象
        AutoFill annotation = method.getAnnotation(AutoFill.class);// 获取指定注解
        OperationType value = annotation.value();// 获取注解的属性值


        // 2、使用反射，找到目标参数的对象
        Object[] args = joinPoint.getArgs();
        if (args == null && args.length == 0) {
            return;
        }
        Object entity = args[0];  // 拿到实体对象

        // 3、判断属性值，如果是INSERT，则自动填充创建时间和更新时间，创建人和更新人
        try {
            if (value == OperationType.INSERT) {
                // 通过反射，找到实体对象
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                setCreateTime.invoke(entity, LocalDateTime.now());
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                setCreateUser.invoke(entity, BaseContext.getCurrentId());
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());

            }else if (value == OperationType.UPDATE) {
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                setUpdateTime.invoke(entity, LocalDateTime.now());
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                setUpdateUser.invoke(entity, BaseContext.getCurrentId());
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
